Much to Ibara's shock and dismay, Senku devised a plan and managed to escape petrification. Now the two enter into a head-to-head battle for control of the Medusa device.
As long as I can't experiment, 
I have no way to know for sure.
.لا توجد طريقة للتأكد ما دمت لا أستطيع أن أجرّب
Da ich’s nicht getestet habe,
habe ich absolut keine Ahnung.
Non posso sperimentare,
Enquanto eu não conseguir fazer um 
experimento, não tenho como ter certeza.
Без экспериментов
я не могу знать наверняка!